ProcessList.java revision ecf1cda068c95c58d296d508d34706d659e4a1ae
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.android.server.am; 18 19import java.io.IOException; 20import java.io.OutputStream; 21import java.nio.ByteBuffer; 22 23import android.app.ActivityManager; 24import android.os.SystemClock; 25import com.android.internal.util.MemInfoReader; 26import com.android.server.wm.WindowManagerService; 27 28import android.content.res.Resources; 29import android.graphics.Point; 30import android.os.SystemProperties; 31import android.net.LocalSocketAddress; 32import android.net.LocalSocket; 33import android.util.Slog; 34import android.view.Display; 35 36/** 37 * Activity manager code dealing with processes. 38 */ 39final class ProcessList { 40 // The minimum time we allow between crashes, for us to consider this 41 // application to be bad and stop and its services and reject broadcasts. 42 static final int MIN_CRASH_INTERVAL = 60*1000; 43 44 // OOM adjustments for processes in various states: 45 46 // Adjustment used in certain places where we don't know it yet. 47 // (Generally this is something that is going to be cached, but we 48 // don't know the exact value in the cached range to assign yet.) 49 static final int UNKNOWN_ADJ = 16; 50 51 // This is a process only hosting activities that are not visible, 52 // so it can be killed without any disruption. 53 static final int CACHED_APP_MAX_ADJ = 15; 54 static final int CACHED_APP_MIN_ADJ = 9; 55 56 // The B list of SERVICE_ADJ -- these are the old and decrepit 57 // services that aren't as shiny and interesting as the ones in the A list. 58 static final int SERVICE_B_ADJ = 8; 59 60 // This is the process of the previous application that the user was in. 61 // This process is kept above other things, because it is very common to 62 // switch back to the previous app. This is important both for recent 63 // task switch (toggling between the two top recent apps) as well as normal 64 // UI flow such as clicking on a URI in the e-mail app to view in the browser, 65 // and then pressing back to return to e-mail. 66 static final int PREVIOUS_APP_ADJ = 7; 67 68 // This is a process holding the home application -- we want to try 69 // avoiding killing it, even if it would normally be in the background, 70 // because the user interacts with it so much. 71 static final int HOME_APP_ADJ = 6; 72 73 // This is a process holding an application service -- killing it will not 74 // have much of an impact as far as the user is concerned. 75 static final int SERVICE_ADJ = 5; 76 77 // This is a process with a heavy-weight application. It is in the 78 // background, but we want to try to avoid killing it. Value set in 79 // system/rootdir/init.rc on startup. 80 static final int HEAVY_WEIGHT_APP_ADJ = 4; 81 82 // This is a process currently hosting a backup operation. Killing it 83 // is not entirely fatal but is generally a bad idea. 84 static final int BACKUP_APP_ADJ = 3; 85 86 // This is a process only hosting components that are perceptible to the 87 // user, and we really want to avoid killing them, but they are not 88 // immediately visible. An example is background music playback. 89 static final int PERCEPTIBLE_APP_ADJ = 2; 90 91 // This is a process only hosting activities that are visible to the 92 // user, so we'd prefer they don't disappear. 93 static final int VISIBLE_APP_ADJ = 1; 94 95 // This is the process running the current foreground app. We'd really 96 // rather not kill it! 97 static final int FOREGROUND_APP_ADJ = 0; 98 99 // This is a system persistent process, such as telephony. Definitely 100 // don't want to kill it, but doing so is not completely fatal. 101 static final int PERSISTENT_PROC_ADJ = -12; 102 103 // The system process runs at the default adjustment. 104 static final int SYSTEM_ADJ = -16; 105 106 // Special code for native processes that are not being managed by the system (so 107 // don't have an oom adj assigned by the system). 108 static final int NATIVE_ADJ = -17; 109 110 // Memory pages are 4K. 111 static final int PAGE_SIZE = 4*1024; 112 113 // The minimum number of cached apps we want to be able to keep around, 114 // without empty apps being able to push them out of memory. 115 static final int MIN_CACHED_APPS = 2; 116 117 // The maximum number of cached processes we will keep around before killing them. 118 // NOTE: this constant is *only* a control to not let us go too crazy with 119 // keeping around processes on devices with large amounts of RAM. For devices that 120 // are tighter on RAM, the out of memory killer is responsible for killing background 121 // processes as RAM is needed, and we should *never* be relying on this limit to 122 // kill them. Also note that this limit only applies to cached background processes; 123 // we have no limit on the number of service, visible, foreground, or other such 124 // processes and the number of those processes does not count against the cached 125 // process limit. 126 static final int MAX_CACHED_APPS = 24; 127 128 // We allow empty processes to stick around for at most 30 minutes. 129 static final long MAX_EMPTY_TIME = 30*60*1000; 130 131 // The maximum number of empty app processes we will let sit around. 132 private static final int MAX_EMPTY_APPS = computeEmptyProcessLimit(MAX_CACHED_APPS); 133 134 // The number of empty apps at which we don't consider it necessary to do 135 // memory trimming. 136 static final int TRIM_EMPTY_APPS = MAX_EMPTY_APPS/2; 137 138 // The number of cached at which we don't consider it necessary to do 139 // memory trimming. 140 static final int TRIM_CACHED_APPS = ((MAX_CACHED_APPS-MAX_EMPTY_APPS)*2)/3; 141 142 // Threshold of number of cached+empty where we consider memory critical. 143 static final int TRIM_CRITICAL_THRESHOLD = 3; 144 145 // Threshold of number of cached+empty where we consider memory critical. 146 static final int TRIM_LOW_THRESHOLD = 5; 147 148 // Low Memory Killer Daemon command codes. 149 // These must be kept in sync with the definitions in lmkd.c 150 // 151 // LMK_TARGET <minfree> <minkillprio> ... (up to 6 pairs) 152 // LMK_PROCPRIO <pid> <prio> 153 // LMK_PROCREMOVE <pid> 154 static final byte LMK_TARGET = 0; 155 static final byte LMK_PROCPRIO = 1; 156 static final byte LMK_PROCREMOVE = 2; 157 158 // These are the various interesting memory levels that we will give to 159 // the OOM killer. Note that the OOM killer only supports 6 slots, so we 160 // can't give it a different value for every possible kind of process. 161 private final int[] mOomAdj = new int[] { 162 FOREGROUND_APP_ADJ, VISIBLE_APP_ADJ, PERCEPTIBLE_APP_ADJ, 163 BACKUP_APP_ADJ, CACHED_APP_MIN_ADJ, CACHED_APP_MAX_ADJ 164 }; 165 // These are the low-end OOM level limits. This is appropriate for an 166 // HVGA or smaller phone with less than 512MB. Values are in KB. 167 private final int[] mOomMinFreeLow = new int[] { 168 8192, 12288, 16384, 169 24576, 28672, 32768 170 }; 171 // These are the high-end OOM level limits. This is appropriate for a 172 // 1280x800 or larger screen with around 1GB RAM. Values are in KB. 173 private final int[] mOomMinFreeHigh = new int[] { 174 49152, 61440, 73728, 175 86016, 98304, 122880 176 }; 177 // The actual OOM killer memory levels we are using. 178 private final int[] mOomMinFree = new int[mOomAdj.length]; 179 180 private final long mTotalMemMb; 181 182 private long mCachedRestoreLevel; 183 184 private boolean mHaveDisplaySize; 185 186 private static LocalSocket sLmkdSocket; 187 private static OutputStream sLmkdOutputStream; 188 189 ProcessList() { 190 MemInfoReader minfo = new MemInfoReader(); 191 minfo.readMemInfo(); 192 mTotalMemMb = minfo.getTotalSize()/(1024*1024); 193 updateOomLevels(0, 0, false); 194 } 195 196 void applyDisplaySize(WindowManagerService wm) { 197 if (!mHaveDisplaySize) { 198 Point p = new Point(); 199 wm.getBaseDisplaySize(Display.DEFAULT_DISPLAY, p); 200 if (p.x != 0 && p.y != 0) { 201 updateOomLevels(p.x, p.y, true); 202 mHaveDisplaySize = true; 203 } 204 } 205 } 206 207 private void updateOomLevels(int displayWidth, int displayHeight, boolean write) { 208 // Scale buckets from avail memory: at 300MB we use the lowest values to 209 // 700MB or more for the top values. 210 float scaleMem = ((float)(mTotalMemMb-300))/(700-300); 211 212 // Scale buckets from screen size. 213 int minSize = 480*800; // 384000 214 int maxSize = 1280*800; // 1024000 230400 870400 .264 215 float scaleDisp = ((float)(displayWidth*displayHeight)-minSize)/(maxSize-minSize); 216 if (false) { 217 Slog.i("XXXXXX", "scaleMem=" + scaleMem); 218 Slog.i("XXXXXX", "scaleDisp=" + scaleDisp + " dw=" + displayWidth 219 + " dh=" + displayHeight); 220 } 221 222 float scale = scaleMem > scaleDisp ? scaleMem : scaleDisp; 223 if (scale < 0) scale = 0; 224 else if (scale > 1) scale = 1; 225 int minfree_adj = Resources.getSystem().getInteger( 226 com.android.internal.R.integer.config_lowMemoryKillerMinFreeKbytesAdjust); 227 int minfree_abs = Resources.getSystem().getInteger( 228 com.android.internal.R.integer.config_lowMemoryKillerMinFreeKbytesAbsolute); 229 if (false) { 230 Slog.i("XXXXXX", "minfree_adj=" + minfree_adj + " minfree_abs=" + minfree_abs); 231 } 232 233 for (int i=0; i<mOomAdj.length; i++) { 234 int low = mOomMinFreeLow[i]; 235 int high = mOomMinFreeHigh[i]; 236 mOomMinFree[i] = (int)(low + ((high-low)*scale)); 237 } 238 239 if (minfree_abs >= 0) { 240 for (int i=0; i<mOomAdj.length; i++) { 241 mOomMinFree[i] = (int)((float)minfree_abs * mOomMinFree[i] / mOomMinFree[mOomAdj.length - 1]); 242 } 243 } 244 245 if (minfree_adj != 0) { 246 for (int i=0; i<mOomAdj.length; i++) { 247 mOomMinFree[i] += (int)((float)minfree_adj * mOomMinFree[i] / mOomMinFree[mOomAdj.length - 1]); 248 if (mOomMinFree[i] < 0) { 249 mOomMinFree[i] = 0; 250 } 251 } 252 } 253 254 // The maximum size we will restore a process from cached to background, when under 255 // memory duress, is 1/3 the size we have reserved for kernel caches and other overhead 256 // before killing background processes. 257 mCachedRestoreLevel = (getMemLevel(ProcessList.CACHED_APP_MAX_ADJ)/1024) / 3; 258 259 // Ask the kernel to try to keep enough memory free to allocate 3 full 260 // screen 32bpp buffers without entering direct reclaim. 261 int reserve = displayWidth * displayHeight * 4 * 3 / 1024; 262 int reserve_adj = Resources.getSystem().getInteger(com.android.internal.R.integer.config_extraFreeKbytesAdjust); 263 int reserve_abs = Resources.getSystem().getInteger(com.android.internal.R.integer.config_extraFreeKbytesAbsolute); 264 265 if (reserve_abs >= 0) { 266 reserve = reserve_abs; 267 } 268 269 if (reserve_adj != 0) { 270 reserve += reserve_adj; 271 if (reserve < 0) { 272 reserve = 0; 273 } 274 } 275 276 if (write) { 277 ByteBuffer buf = ByteBuffer.allocate(4 * (2*mOomAdj.length + 1)); 278 buf.putInt(LMK_TARGET); 279 for (int i=0; i<mOomAdj.length; i++) { 280 buf.putInt((mOomMinFree[i]*1024)/PAGE_SIZE); 281 buf.putInt(mOomAdj[i]); 282 } 283 284 writeLmkd(buf); 285 SystemProperties.set("sys.sysctl.extra_free_kbytes", Integer.toString(reserve)); 286 } 287 // GB: 2048,3072,4096,6144,7168,8192 288 // HC: 8192,10240,12288,14336,16384,20480 289 } 290 291 public static int computeEmptyProcessLimit(int totalProcessLimit) { 292 return (totalProcessLimit*2)/3; 293 } 294 295 private static String buildOomTag(String prefix, String space, int val, int base) { 296 if (val == base) { 297 if (space == null) return prefix; 298 return prefix + " "; 299 } 300 return prefix + "+" + Integer.toString(val-base); 301 } 302 303 public static String makeOomAdjString(int setAdj) { 304 if (setAdj >= ProcessList.CACHED_APP_MIN_ADJ) { 305 return buildOomTag("cch", " ", setAdj, ProcessList.CACHED_APP_MIN_ADJ); 306 } else if (setAdj >= ProcessList.SERVICE_B_ADJ) { 307 return buildOomTag("svcb ", null, setAdj, ProcessList.SERVICE_B_ADJ); 308 } else if (setAdj >= ProcessList.PREVIOUS_APP_ADJ) { 309 return buildOomTag("prev ", null, setAdj, ProcessList.PREVIOUS_APP_ADJ); 310 } else if (setAdj >= ProcessList.HOME_APP_ADJ) { 311 return buildOomTag("home ", null, setAdj, ProcessList.HOME_APP_ADJ); 312 } else if (setAdj >= ProcessList.SERVICE_ADJ) { 313 return buildOomTag("svc ", null, setAdj, ProcessList.SERVICE_ADJ); 314 } else if (setAdj >= ProcessList.HEAVY_WEIGHT_APP_ADJ) { 315 return buildOomTag("hvy ", null, setAdj, ProcessList.HEAVY_WEIGHT_APP_ADJ); 316 } else if (setAdj >= ProcessList.BACKUP_APP_ADJ) { 317 return buildOomTag("bkup ", null, setAdj, ProcessList.BACKUP_APP_ADJ); 318 } else if (setAdj >= ProcessList.PERCEPTIBLE_APP_ADJ) { 319 return buildOomTag("prcp ", null, setAdj, ProcessList.PERCEPTIBLE_APP_ADJ); 320 } else if (setAdj >= ProcessList.VISIBLE_APP_ADJ) { 321 return buildOomTag("vis ", null, setAdj, ProcessList.VISIBLE_APP_ADJ); 322 } else if (setAdj >= ProcessList.FOREGROUND_APP_ADJ) { 323 return buildOomTag("fore ", null, setAdj, ProcessList.FOREGROUND_APP_ADJ); 324 } else if (setAdj >= ProcessList.PERSISTENT_PROC_ADJ) { 325 return buildOomTag("pers ", null, setAdj, ProcessList.PERSISTENT_PROC_ADJ); 326 } else if (setAdj >= ProcessList.SYSTEM_ADJ) { 327 return buildOomTag("sys ", null, setAdj, ProcessList.SYSTEM_ADJ); 328 } else if (setAdj >= ProcessList.NATIVE_ADJ) { 329 return buildOomTag("ntv ", null, setAdj, ProcessList.NATIVE_ADJ); 330 } else { 331 return Integer.toString(setAdj); 332 } 333 } 334 335 public static String makeProcStateString(int curProcState) { 336 String procState; 337 switch (curProcState) { 338 case -1: 339 procState = "N "; 340 break; 341 case ActivityManager.PROCESS_STATE_PERSISTENT: 342 procState = "P "; 343 break; 344 case ActivityManager.PROCESS_STATE_PERSISTENT_UI: 345 procState = "PU"; 346 break; 347 case ActivityManager.PROCESS_STATE_TOP: 348 procState = "T "; 349 break; 350 case ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND: 351 procState = "IF"; 352 break; 353 case ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND: 354 procState = "IB"; 355 break; 356 case ActivityManager.PROCESS_STATE_BACKUP: 357 procState = "BU"; 358 break; 359 case ActivityManager.PROCESS_STATE_HEAVY_WEIGHT: 360 procState = "HW"; 361 break; 362 case ActivityManager.PROCESS_STATE_SERVICE: 363 procState = "S "; 364 break; 365 case ActivityManager.PROCESS_STATE_RECEIVER: 366 procState = "R "; 367 break; 368 case ActivityManager.PROCESS_STATE_HOME: 369 procState = "HO"; 370 break; 371 case ActivityManager.PROCESS_STATE_LAST_ACTIVITY: 372 procState = "LA"; 373 break; 374 case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY: 375 procState = "CA"; 376 break; 377 case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT: 378 procState = "Ca"; 379 break; 380 case ActivityManager.PROCESS_STATE_CACHED_EMPTY: 381 procState = "CE"; 382 break; 383 default: 384 procState = "??"; 385 break; 386 } 387 return procState; 388 } 389 390 public static void appendRamKb(StringBuilder sb, long ramKb) { 391 for (int j=0, fact=10; j<6; j++, fact*=10) { 392 if (ramKb < fact) { 393 sb.append(' '); 394 } 395 } 396 sb.append(ramKb); 397 } 398 399 // The minimum amount of time after a state change it is safe ro collect PSS. 400 public static final int PSS_MIN_TIME_FROM_STATE_CHANGE = 15*1000; 401 402 // The maximum amount of time we want to go between PSS collections. 403 public static final int PSS_MAX_INTERVAL = 30*60*1000; 404 405 // The minimum amount of time between successive PSS requests for *all* processes. 406 public static final int PSS_ALL_INTERVAL = 10*60*1000; 407 408 // The minimum amount of time between successive PSS requests for a process. 409 private static final int PSS_SHORT_INTERVAL = 2*60*1000; 410 411 // The amount of time until PSS when a process first becomes top. 412 private static final int PSS_FIRST_TOP_INTERVAL = 10*1000; 413 414 // The amount of time until PSS when a process first goes into the background. 415 private static final int PSS_FIRST_BACKGROUND_INTERVAL = 20*1000; 416 417 // The amount of time until PSS when a process first becomes cached. 418 private static final int PSS_FIRST_CACHED_INTERVAL = 30*1000; 419 420 // The amount of time until PSS when an important process stays in the same state. 421 private static final int PSS_SAME_IMPORTANT_INTERVAL = 15*60*1000; 422 423 // The amount of time until PSS when a service process stays in the same state. 424 private static final int PSS_SAME_SERVICE_INTERVAL = 20*60*1000; 425 426 // The amount of time until PSS when a cached process stays in the same state. 427 private static final int PSS_SAME_CACHED_INTERVAL = 30*60*1000; 428 429 public static final int PROC_MEM_PERSISTENT = 0; 430 public static final int PROC_MEM_TOP = 1; 431 public static final int PROC_MEM_IMPORTANT = 2; 432 public static final int PROC_MEM_SERVICE = 3; 433 public static final int PROC_MEM_CACHED = 4; 434 435 private static final int[] sProcStateToProcMem = new int[] { 436 PROC_MEM_PERSISTENT, // ActivityManager.PROCESS_STATE_PERSISTENT 437 PROC_MEM_PERSISTENT, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 438 PROC_MEM_TOP, // ActivityManager.PROCESS_STATE_TOP 439 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 440 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 441 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_BACKUP 442 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 443 PROC_MEM_SERVICE, // ActivityManager.PROCESS_STATE_SERVICE 444 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_RECEIVER 445 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_HOME 446 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 447 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 448 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 449 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 450 }; 451 452 private static final long[] sFirstAwakePssTimes = new long[] { 453 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 454 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 455 PSS_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 456 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 457 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 458 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 459 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 460 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 461 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 462 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 463 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 464 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 465 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 466 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 467 }; 468 469 private static final long[] sSameAwakePssTimes = new long[] { 470 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 471 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 472 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 473 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 474 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 475 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 476 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 477 PSS_SAME_SERVICE_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 478 PSS_SAME_SERVICE_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 479 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 480 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 481 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 482 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 483 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 484 }; 485 486 public static boolean procStatesDifferForMem(int procState1, int procState2) { 487 return sProcStateToProcMem[procState1] != sProcStateToProcMem[procState2]; 488 } 489 490 public static long computeNextPssTime(int procState, boolean first, boolean sleeping, 491 long now) { 492 final long[] table = sleeping 493 ? (first 494 ? sFirstAwakePssTimes 495 : sSameAwakePssTimes) 496 : (first 497 ? sFirstAwakePssTimes 498 : sSameAwakePssTimes); 499 return now + table[procState]; 500 } 501 502 long getMemLevel(int adjustment) { 503 for (int i=0; i<mOomAdj.length; i++) { 504 if (adjustment <= mOomAdj[i]) { 505 return mOomMinFree[i] * 1024; 506 } 507 } 508 return mOomMinFree[mOomAdj.length-1] * 1024; 509 } 510 511 /** 512 * Return the maximum pss size in kb that we consider a process acceptable to 513 * restore from its cached state for running in the background when RAM is low. 514 */ 515 long getCachedRestoreThresholdKb() { 516 return mCachedRestoreLevel; 517 } 518 519 /** 520 * Set the out-of-memory badness adjustment for a process. 521 * 522 * @param pid The process identifier to set. 523 * @param uid The uid of the app 524 * @param amt Adjustment value -- lmkd allows -16 to +15. 525 * 526 * {@hide} 527 */ 528 public static final void setOomAdj(int pid, int uid, int amt) { 529 if (amt == UNKNOWN_ADJ) 530 return; 531 532 long start = SystemClock.elapsedRealtime(); 533 ByteBuffer buf = ByteBuffer.allocate(4 * 4); 534 buf.putInt(LMK_PROCPRIO); 535 buf.putInt(pid); 536 buf.putInt(uid); 537 buf.putInt(amt); 538 writeLmkd(buf); 539 long now = SystemClock.elapsedRealtime(); 540 if ((now-start) > 250) { 541 Slog.w("ActivityManager", "SLOW OOM ADJ: " + (now-start) + "ms for pid " + pid 542 + " = " + amt); 543 } 544 } 545 546 /* 547 * {@hide} 548 */ 549 public static final void remove(int pid) { 550 ByteBuffer buf = ByteBuffer.allocate(4 * 2); 551 buf.putInt(LMK_PROCREMOVE); 552 buf.putInt(pid); 553 writeLmkd(buf); 554 } 555 556 private static boolean openLmkdSocket() { 557 try { 558 sLmkdSocket = new LocalSocket(LocalSocket.SOCKET_SEQPACKET); 559 sLmkdSocket.connect( 560 new LocalSocketAddress("lmkd", 561 LocalSocketAddress.Namespace.RESERVED)); 562 sLmkdOutputStream = sLmkdSocket.getOutputStream(); 563 } catch (IOException ex) { 564 Slog.w(ActivityManagerService.TAG, 565 "lowmemorykiller daemon socket open failed"); 566 sLmkdSocket = null; 567 return false; 568 } 569 570 return true; 571 } 572 573 private static void writeLmkd(ByteBuffer buf) { 574 575 for (int i = 0; i < 3; i++) { 576 if (sLmkdSocket == null) { 577 if (openLmkdSocket() == false) { 578 try { 579 Thread.sleep(1000); 580 } catch (InterruptedException ie) { 581 } 582 continue; 583 } 584 } 585 586 try { 587 sLmkdOutputStream.write(buf.array(), 0, buf.position()); 588 return; 589 } catch (IOException ex) { 590 Slog.w(ActivityManagerService.TAG, 591 "Error writing to lowmemorykiller socket"); 592 593 try { 594 sLmkdSocket.close(); 595 } catch (IOException ex2) { 596 } 597 598 sLmkdSocket = null; 599 } 600 } 601 } 602} 603